Žižka, Miroslav, Vladimíra Hovorková Valentová, and Lukáš Turčok. “Performance Evaluation of Czech Innovative Companies: Data Envelopment Analysis Approach”. International Journal of Strategic Property Management 20, no. 4 (December 14, 2016): 427-438. Accessed January 9, 2025. https://jcem.vgtu.lt/index.php/IJSPM/article/view/2101.